Intro to Millwright Practice Exam 2025 – Comprehensive All-In-One Guide for Exam Success!

Dipping a chisel or drill bit in cool water after each pass serves the primary purpose of maintaining the hardness of the tool. When cutting or drilling materials, the tool generates heat due to friction. Excessive heat can cause the tool's material to soften, which may lead to decreased cutting efficiency and potentially damage the tool over time. By cooling the tool in water, the heat generated during the operation is dissipated, helping to retain its hardness and ensuring that it maintains its cutting edge. This practice is particularly important for tools made of high-carbon steel or similar materials that can lose hardness at elevated temperatures.